Symptoms
When a user logs into Outlook Web App (OWA) in Microsoft Exchange Server 2016 and tries to enable the offline access function (OWA > Settings > Offline Settings > Turn on offline access), the setting screen disappears after he selects the Turn on offline access check box.
Resolution
For Exchange Server 2016, install Cumulative Update 9 or a later cumulative update for Exchange Server 2016.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.